U.S. patent application number 11/190615 was filed with the patent office on 2006-02-02 for image observation apparatus.
Invention is credited to Takashi Fukaya, Tomonori Ishikawa, Junichi Nozawa, Satoshi Otsuka.
Application Number | 20060023324 11/190615 |
Document ID | / |
Family ID | 35731842 |
Filed Date | 2006-02-02 |
United States Patent
Application |
20060023324 |
Kind Code |
A1 |
Otsuka; Satoshi ; et
al. |
February 2, 2006 |
Image observation apparatus
Abstract
An image observation apparatus comprising an image display unit
for displaying an observation image and a supporting mechanism for
supporting the image display unit movably and adjustably in the
directions of three, substantially perpendicular axes. Since the
supporting mechanism of this image observation apparatus can move
and adjust the image display unit in three orthogonal axial
directions, an operator need not select a plurality of articulates
for operating them when he/she wants to move the image display unit
to a desired axial direction. Further, one of the three axes can be
a rotational axis for turnably supporting the image display unit
around the operator. According to this configuration, the image
display unit can be independently moved and adjusted in three axial
directions, while the observation angle of the observer with
respect to the display face of the image display unit is kept
constant.
Inventors: |
Otsuka; Satoshi; (Tokyo,
JP) ; Fukaya; Takashi; (Tokyo, JP) ; Nozawa;
Junichi; (Sagamihara-shi, JP) ; Ishikawa;
Tomonori; (Tokyo, JP) |
Correspondence
Address: |
OSTROLENK FABER GERB & SOFFEN
1180 AVENUE OF THE AMERICAS
NEW YORK
NY
100368403
US
|
Family ID: |
35731842 |
Appl. No.: |
11/190615 |
Filed: |
July 27, 2005 |
Current U.S.
Class: |
359/871 |
Current CPC
Class: |
F16M 2200/048 20130101;
F16M 11/10 20130101; F16M 11/28 20130101; F16M 11/42 20130101; A61B
90/37 20160201; F16M 11/2021 20130101; G02B 7/001 20130101; A61B
2090/372 20160201; F16M 11/2092 20130101; G02B 27/0149 20130101;
F16M 11/2014 20130101; A61B 90/50 20160201 |
Class at
Publication: |
359/871 |
International
Class: |
G02B 7/182 20060101
G02B007/182 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 30, 2004 |
JP |
2004-224665 |
Claims
1. An image observation apparatus comprising: an image display unit
for displaying an image; and a supporting mechanism for supporting
the image display unit movably and adjustably along the directions
of three axes that extend substantially perpendicularly to each
other.
2. An image observation apparatus according to claim 1, wherein the
three axes of the supporting mechanism include a rotational axis
for turnably supporting the image display unit around an
observer.
3. An image observation apparatus according to claim 1, wherein the
three axes of the supporting mechanism include a rotational axis
positioned substantially above the cervical vertebrae of an
observer.
4. An image observation apparatus according to claim 1, wherein the
supporting mechanism includes a first rotational axis for turnably
supporting the image display unit, the three axes of the supporting
mechanism include a second rotational axis that is turnable and
capable of being arranged across an observer with respect to the
first rotational axis, and wherein the image observation apparatus
further comprises a linking mechanism for linking a turning angle
of the first rotational axis of the supporting mechanism with a
turning angle of the second rotational axis.
5. An image observation apparatus according to claim 1, wherein the
supporting mechanism includes a column, and an arm unit for
mounting the image display unit to the column in a movable and
adjustable manner.
6. An image observation apparatus according to claim 5, wherein at
least one of the column and the arm unit is formed by a plurality
of members that are slidably coupled, so that one of the column and
the arm unit can be extended.
7. An image observation apparatus according to claim 1, wherein the
supporting mechanism is mounted to a seat for an observer.
8. An image displaying apparatus comprising: an image display unit;
a supporting mechanism for supporting the image display unit; and a
vertical turning mechanism provided substantially on a vertical
axis extending through an observer's neck and turnable about the
vertical axis.
9. A supporting device for an image display unit, comprising: a
supporting mechanism for supporting an image display unit; a
vertical turning mechanism having a turnable vertical rotational
axis provided in the back of an observer; a second vertical turning
mechanism provided near the supporting mechanism of the image
display unit; and a turning linkage mechanism for turning the
second vertical turning mechanism in accordance with the turning
angle of the vertical turning mechanism.
10. An image observation apparatus comprising: a vertical slide
mechanism capable of moving an image display unit in a vertical
direction linearly; and a back-and-forth slide mechanism capable of
moving the image display unit on a horizontal plane in a direction
normal to the image display face of the image display unit, wherein
operation directions of the vertical slide mechanism and the
back-and-forth slide mechanism are set in different directions.
11. An image observation apparatus comprising: a chair for by an
observer; a vertical turning mechanism arranged on a vertical axis
substantially aligned to the position of the seated observer and
having its proximal end on the chair; a horizontal member supported
turnably by the vertical turning mechanism and arranged to extend
backward of the chair; a back-and-forth slide mechanism arranged on
the horizontal member and having a sliding member or a rolling
member in the extending direction; a vertical arm unit arranged and
supported at the distal end of the horizontal member and extending
in the vertical direction; a vertical slide mechanism arranged in
the vertical arm unit and made of a sliding member or a rolling
member; a horizontal arm unit supported by the vertical slide
mechanism and extending to in front of the observer; and an image
display unit arranged at the distal end of the horizontal arm unit
and having a normal axis extending from the center of its image
display face and substantially aligned to the observer.
12. An image observation apparatus according to claim 11, wherein
the horizontal arm unit includes a turning member which has a
C-shape arranged substantially horizontally surrounding the
observer and which is turnable symmetrically about the normal axis
arranged at proximal end of the horizontal arm.
13. An image observation apparatus according to claim 11, wherein
the horizontal arm unit includes a second turning member arranged
at proximal end of the horizontal arm unit and having its turning
center arranged in a horizontal plane normal to the normal axis.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of
priority from prior Japanese Patent Application No. 2004-224665,
filed Jul. 30, 2004, the entire contents of which are incorporated
herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] This invention relates to an image observation apparatus
used for observing an operative site in an enlarged scale during a
surgical operation. The fields of surgical operations include
neurosurgery, ophthalmology and orthopedic surgery and the
like.
[0004] 2. Description of the Related Art
[0005] In recent years, surgical operations are often performed in
a style in which an image of an operative site is displayed on an
image display unit such as an LCD monitor of a display apparatus.
The surgeon observes the displayed image on the display unit to
carry out a desired treatment. In practice, however, many treating
devices or other observation devices are concentrated near the
operative site. Therefore, it is desirable that the image
observation apparatus be easily installed at a position that does
not interfere with those many other devices. Specifically, if the
image observation apparatus is located such that the surgeon has to
look up, the surgeon becomes fatigued over time. Therefore, as a
first requirement, when the image observation apparatus needs to be
moved, it is desirable that the image display unit of the image
observation apparatus be kept at a sufficient distance from the
surgeon within the same horizontal plane, i.e., at the height of
the surgeon's eyes.
[0006] On the other hand, the surgeon may often need to observe the
operative site directly, without using the image observation
apparatus. In the course of an operation, the surgeon may need to
alternate between using the monitor observation and direct-viewing
of the operative site. Therefore, as a second requirement, it is
desirable that the image observation apparatus be easily movable
away from the operative site when the apparatus is not in use.
[0007] In a lengthy operation, moreover, many surgeons often attend
the operation alternately. Therefore, as a third requirement, it is
desirable that the position of the image observation apparatus be
easily adjustable during the operation to accommodate the height of
the current surgeon.
[0008] In addition to the first to third requirements described
above, the image observation apparatus should be sized to save
space in the crowded operating room where many devices are arranged
around the patient. Therefore, if a supporting device of the image
observation apparatus is large-sized or if an additional space is
required for the position change of an image display unit, it
difficult to arrange necessary devices in the operating room. This
difficulty may leads to a problem of lowering efficiency of the
operation.
[0009] In view of such a problem, JP-A-7-16238 and JP-A-11-318936
have proposed an image observation apparatus, in which a display
device such as a monitor is movably provided in three dimensional
space with a multi-articulated arm-structure having a plurality of
articulations for supporting the image display device. An operator
must select a plurality of appropriate arms and actuate the
selected arms to locate the display device at a disable
position.
[0010] JP-A-2003-233031 has proposed an image observation apparatus
wherein a display device, as an image display unit, comprises an
image projecting unit and a light reflecting member instead of the
monitor. The image projecting unit and light reflecting member are
arranged to face each other while keeping their relative positions
constant through a support member having a similar
multi-articulated arm structure. In this display device of
JP-A-2003-233031, moreover, there is also disclosed a technique, in
which the second requirement can be met by making the light
reflecting unit detachable from the support member.
BRIEF SUMMARY OF THE INVENTION
[0011] This invention seeks to provide an image observation
apparatus comprising: an image display unit for displaying an
observation image; and a supporting mechanism that movably and
adjustably supports the image display unit along and about three
substantially perpendicular axes.
[0012] Thus, the observer can move the image display unit in a
desirable axial direction without having to select and control a
plurality of articulations.
[0013] One of the three axial movements can be realized with a
rotational axis for rotationally supporting the image display unit
around the observer.
[0014] According to this configuration, the image display unit can
be independently moved and adjusted in three axial directions, one
of which includes movement around a rotational axis that traces a
locus around the observer, while the observation angle of the
observer with respect to the display face of the image display unit
is kept constant. As a result, movement of the image display unit
can be controlled conveniently and easily without any complicated
control being required as in the prior art for adjusting the
position of the image display unit finely. Therefore, observer
fatigue is reduced, which improves the operation efficiency.
[0015] The three axes of the supporting mechanism may include a
rotational axis positioned substantially over the cervical
vertebrae of the observer.
[0016] According to the configuration described above, the image
display unit can be independently moved and adjusted around the
axis passing through the cervical vertebrae of the observer through
the supporting mechanism, while keeping the observation angle of
the observer constant. Thus, unlike the prior art, the moving
operation is convenient and easy without the need for complicated
control to adjust the position of the image display unit
finely.
[0017] Moreover, the supporting mechanism can include a first
rotational axis, which is not a member of the three axes, for
turnably supporting the image display unit. In this case, a second
rotational axis, which is a member of the three axes, and a linking
mechanism for linking the turning angle of the first rotational
axis with the turning angle of the second rotational axis is
provided.
[0018] According to the above configuration, when the position of
the image display unit is independently moved and adjusted in the
three axes including the second rotational axis through the
supporting mechanism, the first rotational axis is rotated through
the linking mechanism between the second and first rotational axes
according to the rotation of the second rotational axis, and the
observation angle is kept constant with respect to the display face
of the image display unit. As a result, the moving operation can be
likewise made convenient and easy, reducing surgeon fatigue.
Moreover, the image display unit can be moved around the first axis
so that a simple structure for removing the image display unit is
realized. This configuration improves efficiency.
[0019] As described above, this invention provides an image
observation apparatus with a simple configuration that improves the
efficiency of movements and adjustments thereof, and thus, the
overall efficiency of the operations.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] These and other features, aspects and advantages of the
apparatus and methods of the present invention will become better
understood with regard to the following description, appended
claims, and accompanying drawings, where:
[0021] FIG. 1 is a perspective view showing a construction of an
image observation apparatus according to a first embodiment of the
invention;
[0022] FIG. 2 is a sectional view showing a support structure of
FIG. 1;
[0023] FIG. 3 is a perspective view showing an imaging system of
FIG. 1;
[0024] FIG. 4 is a perspective view showing a construction of an
image observation apparatus according to a second embodiment of the
invention;
[0025] FIG. 5 is a sectional view showing a support structure of
FIG. 4;
[0026] FIG. 6 is a sectional view indicated in FIG. 5;
[0027] FIG. 7 is a perspective view showing a construction of an
image observation apparatus according to a third embodiment of the
invention;
[0028] FIG. 8 is a partially sectional view showing a portion of a
support structure of FIG. 7;
[0029] FIG. 9 is a perspective view showing a construction of a
modification example of the image observation apparatus according
to the third embodiment of the invention;
[0030] FIG. 10 is a sectional view showing a main part of support
structure of FIG. 9;
[0031] FIG. 11 is a sectional view showing a stowage or protected
state of FIG. 10;
[0032] FIG. 12 is a sectional view indicated in FIG. 10;
[0033] FIG. 13 is a sectional view indicated in FIG. 10;
[0034] FIG. 14 is a perspective view showing a construction of an
image observation apparatus according to a fourth embodiment of the
invention;
[0035] FIG. 15 is a top plan view showing an arrangement and
construction of a major portion of FIG. 14;
[0036] FIG. 16 is a top plan view shown for explaining an adjusting
action of FIG. 14;
[0037] FIG. 17 is a perspective view showing a construction of an
image observation apparatus according to a fifth embodiment of the
invention; and
[0038] FIG. 18 is a perspective view showing a configuration of a
control system of FIG. 17.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0039] Embodiments of the invention will be described below with
reference to the accompanying drawings.
[0040] FIG. 1 shows an image observation apparatus according to a
first embodiment of the invention. A base 1 is placed on the floor
behind a surgeon 2 or an observer, and a housing 3 of a hollow
structure is erected thereon from the base 1. In this housing 3, as
shown in FIG. 2, one end of a vertical mover 4 is fitted to move
freely in the vertical direction through a cross roller bearing 5.
The housing 3, vertical mover 4 and cross roller bearing 5 are
contained in a vertical slide mechanism forming part of a
supporting mechanism.
[0041] Between the lower end of the vertical mover 4 and the
housing 3, moreover, there is arranged a balance spring 27,
operating under compression. The upper end of the vertical mover 4
is bent toward the surgeon 2 and extends to the vicinity of the
head of the surgeon 2. This extension has a through hole 6 formed
in its distal end. This through hole 6 has its center axis 7
arranged substantially in alignment with the direction of vertical
axis of the cervical vertebrae of the surgeon 2. In this through
hole 6, there is inserted turnably and snugly a pivot (rotational
axis) 9, which is formed at the proximal end of a turning member
8.
[0042] This pivot 9 is equipped at its distal end with a threaded
portion 11, which protrudes from the through hole 6 and is fastened
by a nut 10. As a result, the turning member 8 is turnably
assembled with the through hole 6 of the vertical mover 4. In
short, the through hole 6 and pivot 9 are contained in a vertical
turning mechanism or journal.
[0043] The turning member 8 is formed substantially in an L-shape
and has its distal end 12 extended horizontally and toward the
surgeon 2 so that the end 12 is inserted slidably and snugly in a
longitudinal mover 13 having a substantially hollow structure. In
the inner wall near the proximal end of the longitudinal mover 13,
a pin 14 protrudes, which snugly fits in a groove 16 formed in the
distal end 12 of the turning member 8, in the direction of an
extension axis 15 of the distal end 12. The longitudinal mover 13
and the turning member 8 form a longitudinal slide mechanism of the
aforementioned supporting mechanism.
[0044] To the distal end of the longitudinal mover 13, moreover, is
attached an image display unit such as an LCD (Liquid Crystal
Display) 17 (FIG. 1). This LCD 17 is equipped at its two sides with
operating knobs 18.
[0045] In FIG. 1, numeral 19 designates an endoscope, which is
gripped by the surgeon 2 and arranged at a desired position of an
operative site 21 of a patient 20. This endoscope 19 is optically
connected at its proximal end not only to a CCD 22 or the like as
an image pickup member but also to a light source device 24 through
a light guide cable 25 (FIG. 3). Of these, the CCD 22 is
electrically connected through a connection cable 251 with a camera
controller 23, which is electrically connected with the LCD 17
through a video signal cable 26.
[0046] During surgery with the configuration thus far described,
the surgeon 2 inserts at first the endoscope 19 into the operative
site 21 of the patient 20 and manipulates the endoscope 19 to take
an image of the operative site. The optical image is converted into
electric signals by the CCD 22 so that the electric signals are
input to the camera controller 23 through the connection cable 251.
Then, the camera controller 23 processes the electric signals to
create image signals, and outputs the image signals to the LCD 17
through the video signal cable 26 so that the image of the
operative site 21 or the observation image picked up by the
endoscope 19 is displayed on the LCD 17. Here, the surgeon 2
performs a desired treatment at the operative site 21 while
observing the image information displayed on the LCD 17.
[0047] Next will be described the works for the surgeon 2 to move
the LCD 17 in case the treating device or another observing device
interferes with the LCD 17 during the operation. At first, in case
the surgeon 2 intends moving the LCD 17 back and forth in the
direction of his or her view, the surgeon 2 grips and moves the
knobs 18 back and forth in the direction of the arrow X, as shown
in FIG. 1. This X-direction control force applied to the knobs 18
is transmitted to the longitudinal mover 13 through the LCD 17.
This control force direction is aligned with the direction of the
axis 15 of the extension of the distal end 12 of the turning member
8 so that the longitudinal mover 13 slides with respect to the
turning member 8. The pin 14 allows sliding movements of the
longitudinal mover 13 and the turning member 8 but prevents turning
movement therebetween around the extension axis 15. As a result,
the LCD 17 slides only in the direction of the extension axis 15
without any turning motion, and its longitudinal position is
adjusted.
[0048] When the surgeon 2 applies control force to the knobs 18 in
the direction of arrow Y, as shown in FIG. 1, the control force is
transmitted to the turning member 8 through the LCD 17 and the
longitudinal mover 13 so that the pivot 9 is turned relative to the
through hole 6. As a result, the LCD 17 is turned around the center
axis 7. This center axis 7 is substantially aligned with the
cervical vertebrae of the surgeon 2. Without changing the body
position with respect to the operative site, therefore, the surgeon
2 is enabled to face the LCD 17 at all times by turning his or her
head toward the LCD 17. This control force in the direction Y is
perpendicular to the axial direction of the extension axis 15 so
that the aforementioned longitudinal mover 13 does not move
relative to the turning member 8.
[0049] Next will be described the case, in which the LCD 17 is
removed so that the surgeon may observe the operative site in a
direct view during a series of operations. At first, the surgeon 2
grips the knobs 18 of the LCD 17 and applies the control force in
the direction of Z, as shown in FIG. 1. This control force, as
applied to the knobs 18, is transmitted through the longitudinal
mover 13 and the turning member 8 to the vertical mover 4. The
cross roller bearing 5 arranged between the housing 3 and the
vertical mover 4 is permitted to move only in the direction Z so
that the LCD 17 is moved in the direction Z.
[0050] At this time, the weight of the structure from the LCD 17 to
the vertical mover 4 is supported by the action of the balance
spring 27. Even if, therefore, the surgeon 2 releases the knobs 18,
the LCD 17 does not naturally move in the vertical direction but is
held at the moved position. Thus, the surgeon 2 can move, if
necessary, the LCD 17 upward away from the operative site 21.
[0051] Even if another surgeon 2 having a different body size takes
over during the operation, the LCD 17 can be set in the desired
state by the same controls. Specifically, the position adjustment
of the LCD 17 in the height direction due to the difference in the
heights of the surgeons can be easily made by the moving adjustment
in the direction Z.
[0052] Thus, by the image observation apparatus, the LCD 17
displaying the observing image is made adjustable independently of
the three substantially perpendicular axis directions X, Y and Z
including the turning axis positioned substantially on the cervical
vertebrae of the surgeon 2. The axial direction is the direction to
which each axis allows the LCD 17 (display unit) to move.
[0053] In the image display device of the first embodiment, a
simple configuration is realized without using the arm structure of
a complicated link mechanism, such as an electromagnetic brake or
the like. Moreover, highly precise movement adjustment of the LCD
17 can be realized to greatly contribute to improvements in the
operation efficiency.
[0054] The first embodiment has been described for the case in
which an observation image such as the image of the operative site
is captured by using the endoscope 9. However, the invention is not
be limited thereto but can be used to display image information
acquired by other well-known devices such as stereoscopic
endoscopes, surgical microscopes, ultrasonic diagnostic apparatus,
MRIs, CTs and the like. In case image information having a parallax
is guided to the eyes of the surgeon 2 as in the stereoscopic
endoscope apparatus or the surgical microscope, a display part such
as the aforementioned LCD 17 can be replaced by the so-called
"parallax barrier" type three-dimensional image display apparatus
or the like, as disclosed in JP-A-5-107663. This replacement is
likewise applicable to all the other embodiments.
[0055] Moreover, the first embodiment has been described for the
case where the vertical balance utilizes the balance spring 27.
But, this balance spring may also be replaced by a coil spring or a
counter weight.
[0056] Moreover, the first embodiment has been described for the
case in which the cross roller bearing 5 is used in the vertical
slide mechanism and in which the slip bearing structure is used in
the longitudinal slide mechanism. However, the invention is not be
limited thereto, but those mechanisms can be additionally
configured by using various regulating members such as spline
bearings for moving the two members in only one moving direction
relative to each other.
[0057] FIG. 4 to FIG. 6 show an image observation apparatus
according to a second embodiment of the invention. In FIG. 4 to
FIG. 6, portions identical to those of the first embodiment have
the same common reference numerals and perform the same
functions.
[0058] This embodiment provides a chair 28 for the surgeon 2 to sit
on during the operation, which chair is equipped on its bottom with
casters 29 at predetermined positions, to enable the surgeon 2 to
move on the floor selectively. This chair 28 has a seat 30 (FIG. 5)
and a vertical pivot 31 below the seat 30. This vertical pivot 31
has a center axis 32 substantially aligned with the cervical
vertebrae of the surgeon 2 when the surgeon 2 is seated. The
vertical pivot 31 is inserted in a through hole 34 formed in a
support member 33 thereby to support the support member 33 snugly
and turnably.
[0059] The vertical pivot 31 is provided at its proximal end with a
flanged portion 36 corresponding to the through hole 34 and at its
distal end with a threaded portion 37. As a result, the vertical
pivot 31 is turnably assembled with the support member 33 by
inserting its threaded portion 37 from one side into the through
hole 34 of the support member 33 and by fastening a nut 35 on its
threaded portion 37 while its flanged portion 36 abuts the
circumference of one side of the through hole 34. The vertical
pivot 31, the support member 33 and the nut 35 are contained in a
vertical turning mechanism.
[0060] The sectional shape of the support member 33 is
substantially a C-shape, preferably having its upper side opened
(FIG. 6). The support member 33 is horizontally extended to the
back of the surgeon 2, i.e., the seat 30. In the recess of that
support member 33, moreover, there is housed one such horizontal
portion 39 of a substantially L-shaped vertically moving housing 38
snugly movable in the extending direction through a cross roller
bearing 41 composing the longitudinal slide mechanism.
[0061] This vertical moving housing 38 has its other vertical
portion 40 formed into a hollow structure to receive a vertical
mover 42 through the cross roller bearing 5 and the balance spring
27 substantially as in the first embodiment. Moreover, the vertical
mover 42 is bent at its upper end toward the surgeon 2 into an
L-shape having an upper end, to which the aforementioned LCD 17 is
attached through an arm member 43. In the described embodiment, the
LCD 17, the surgeon 2 and the extending direction of the support
member 33 are arranged to lie substantially on one line.
[0062] For the described configuration, the manner of moving the
LCD 17 is now described for the case where an operating device or
another observing apparatus interferes with the LCD 17 during the
operation. In case the LCD 17 is moved back and forth in the
viewing direction of the surgeon 2, the surgeon 2 grips the knobs
18 to bring the LCD 17 back and forth in the arrow direction X, as
shown in FIG. 4. Then, the control force in the direction X, as
applied to the knobs 18, is transmitted to the vertical moving
housing 38 through the LCD 17, the arm member 43 and the vertical
mover 42. Here, the vertical moving housing 38 is arranged movably
in the direction X with respect to the support member 33 through
the cross roller bearing 41 so that it is horizontally moved in the
direction X with respect to the support member 33 thereby to bring
the LCD 17 in the horizontal direction.
[0063] When the surgeon 2 applies the control force to the knobs 18
in the direction of arrow Y, as shown in FIG. 4, the control force
is sequentially transmitted as in the aforementioned case of the
movement in the direction X and finally to the support member 33.
Then, the vertical pivot 31 engaging with the through hole 34 of
the support member 33 is so turnably arranged as to have its
turning direction aligned to the direction Y so that the LCD 17 is
turned around the center axis 32 and positionally adjusted in the
direction Y.
[0064] In this second embodiment, too, as in the first embodiment,
the vertical pivot 31 of the chair 28 is aligned substantially with
the position of the cervical vertebrae of the surgeon 2. As a
result, the surgeon 2 always remains facing the LCD 17 merely by
turning his or her neck without changing his or her body position
with respect to the operative site.
[0065] Now will be described the case in which the LCD 17 is
removed for the surgeon 2 to observe the operative site directly,
for example during a series of operations. In this case, the
surgeon 2 grips at first the knobs 18 of the LCD 17 and applies the
control force in the direction of arrow Z, as shown in FIG. 4.
Then, the control force applied to the knobs 18 is transmitted to
the vertical mover 42 through the LCD 17 and the arm member 43. As
a result, the LCD 17 is moved in the direction Z as in the first
embodiment, so that it assumes a non-interfering position.
[0066] For surgeons of different body sizes who alternate during
the operation, the movements and adjustments are made in the
directions X, Y and Z in the control procedure as described above.
For example, the position adjustment of the LCD 17 in the height
direction due to the height difference of a particular surgeon 2 is
made by adjusting the movements in the direction Z.
[0067] According to the second embodiment, no mechanical portion is
provided in the vicinity of the operative site, owing to the
arranging of the longitudinal slide mechanism and the vertical
turning mechanism below the seat 30 of the surgeon 2. As a result,
it is possible to utilize space more effectively.
[0068] Moreover, the configuration is made as such those mechanisms
are arranged in the assembly of the seat 28 for the surgeon 2. As a
result, when the surgeon 2 is seated on the chair 28, the turning
center necessarily aligns substantially with the cervical vertebrae
of the surgeon 2. Therefore, the surgeon 2 can concentrate on the
operating procedures without paying attention to the position of
the turning center or his or her position. This contributes to
improving the operation efficiency.
[0069] FIG. 7 and FIG. 8 show an image observation apparatus
according to a third embodiment of the invention. In FIG. 7 and
FIG. 8, the portions that correspond to those of the first and
second embodiments are not described, but bear the same reference
numerals.
[0070] In the third embodiment, the configuration from the seat 28
to the vertical moving housing 38 is substantially similar to that
of the second embodiment. The lower end of a vertical mover 45 is
movably inserted (as in the second embodiment) into the vertical
portion 40 of the vertical moving housing 38.
[0071] To the upper end of the vertical mover 45 are attached a
pair of image projecting units 46 or the image projecting mechanism
disclosed in JP-A-2003-233031, for example. At an intermediate
portion of the vertical mover 45 there is arranged a horizontal arm
unit 44 through a later-described transverse switching mechanism 47
and a later-described horizontal arm unit housing mechanism 48. At
the distal end of the horizontal arm unit 44 is arranged an image
projection panel 49 or the well-known beam reflecting member
disclosed in JP-A-2003-233031. Moreover, the horizontal arm unit 44
is equipped at its intermediate portion with a grasping grip
56.
[0072] Now there will be described in detail the transverse
switching mechanism 47, which is arranged at the vertical mover 45
(FIG. 8). Specifically, the vertical mover 45 is equipped with a
through hole 57 around the center axis 58 of the image projection
panel 49. A transverse switching stem 59 is engaged snugly and
turnably by that through hole 57. This transverse switching stem 59
is fixed at one end in a housing 64 and is fastened and fixed at
its other end by a nut 65.
[0073] In the outer circumference of the transverse switching stem
59, are formed a pair of fixing holes 63a and 63b, symmetrically
with respect to the center axis 58. These fixing holes 64a and 63b
are selectively engaged by the externally threaded distal end 62 of
a transverse fixing knob 61. This transverse fixing knob 61 is
adjustably fastened in a threaded hole 60 formed in the vertical
mover 45.
[0074] The details of the horizontal arm unit housing mechanism 48
are as follows. In the housing 64, a hole 67 is formed on a center
axis 66 perpendicularly to the center axis 58. In this hole 67 is
snugly and turnably inserted a housing stem 68, which is formed at
the proximal end of the horizontal arm unit 44. The housing stem 68
of the horizontal arm unit 44 is equipped at its two ends with
flanges 69a and 69b, which are formed to correspond to the two ends
of the hole 67 of the housing 64. These flanges 69a and 69b clamp
the two ends of the hole 67 of the housing 64. The flange 69b on
the distal end side is serrated at its end face to engage with a
serrated or coarse portion 72 formed on a push member 71.
[0075] In the outer circumference of the push member 71 are formed
a plurality of grooves 73 at a predetermined interval substantially
in parallel with the center axis 66. Pins 74 disposed in the
housing 64 are so engaged by those grooves 73 as to slide only in
the direction of the center axis 66 thereby to make the so-called
"spline structure".
[0076] Moreover, a housing knob 76 abuts at its distal end against
the end face of the push member 71. Specifically, the housing knob
76 is equipped at its distal end with a threaded portion 761, which
is adjustably fastened at the end of the housing 64 in a threaded
hole 75 formed around the center axis 66.
[0077] The details of a joint structure of the horizontal arm unit
44 and the image projection panel 49 are now described.
Specifically, the horizontal arm unit 44 is equipped at its distal
end with a cylindrical receiving joint member 51. This receiving
joint member 51 is equipped in its side face with a threaded hole
52, which is directed toward the cylindrical center direction of
the receiving joint member 51. At a position symmetric to that
threaded hole 52 with respect to the cylinder center is disposed a
positioning pin 53. This positioning pin 53 protrudes in the
cylindrical center direction from the wall face of the inner
cylinder of the receiving joint member 51. Moreover, a threaded
portion 541 of a fixing knob 54 is adjustably fastened into the
threaded hole 52 of the receiving joint member 51.
[0078] On the other hand, the image projection panel 49 is equipped
on the two upper ends with substantially similar joint members 50a
and 50b. One of these joint members 50a and 50b is selectively
engaged snugly by the receiving joint member 51. These joint
members 50a and 50b are equipped in their longitudinal direction
with grooved portions 55a and 55b, one of which is selectively
engaged snugly by the positioning pin 53.
[0079] Next is described the procedure for moving the image
projection panel 49 when the treating device or another observing
device interferes with the image projection panel 49 during an
operation.
[0080] When the surgeon 2 intends moving back and forth the image
projection panel 49 in the direction of his or her view, the
surgeon 2 grasps the grip 56 to apply the control force back and
forth in the direction of arrow X, as shown in FIG. 7. The control
force in the direction X, as applied to the grip 56, is transmitted
sequentially through the horizontal arm unit 44, the horizontal arm
unit housing mechanism 48 and the transverse switch mechanism 47
and further to the vertical mover 45. Then, the X-direction force
applied to the vertical mover 45 is transmitted, as in the second
embodiment, to the vertical moving housing 38.
[0081] Because the cross roller bearing 41 moves only in the
direction X between the vertical moving housing 38 and the support
member 33, the vertical moving housing 38 is horizontally moved in
the direction X with respect to the support member 33 so that the
image projection panel 49 and the image projecting units 46 are
horizontally moved and adjusted together in the direction X.
[0082] When the surgeon 2 applies the control force in the
direction of arrow Y, as shown in FIG. 4, to the grip 56, the
control force is transmitted in the same order as that for the case
of moving in the direction X so that it is finally transmitted to
the support member 33. Here, the vertical pivot 31 engaged by the
through hole 34 of the support member 33 is turnably disposed in
the direction Y so that the image projection panel 49 and the image
projecting units 46 are turned on the center axis 32 and adjusted
in the direction Y.
[0083] As with the first and second embodiments, the vertical pivot
31 is substantially aligned with the cervical vertebrae of the
surgeon 2 so that the relation between the relative positions of
the image projecting units 46, the image projection panel 49 and
the eyes of the surgeon 2 is always fixed. As a result, the surgeon
2 is enabled to continue the observation merely by turning his or
her head toward the image projection panel 49 without changing his
or her body position with respect to the operation site.
[0084] The case where use of the image projection panel 49 is
dispensed with so that the surgeon 2 may observe the operation site
directly in a series of operations is described as follows. First,
the surgeon 2 grasps the grip 56 of the horizontal arm unit 44 and
applies a control force in direction of arrow Z, as shown in FIG.
6. This control force applied to the grip 56 is transmitted, in an
order substantially similar to that of the aforementioned case of
the direction X, to the vertical mover 45. Then, the vertical mover
45 is moved in the direction Z, as in the first and second
embodiments, so that the image projection panel 49 and the image
projecting units 46 are vertically moved together in the direction
Z.
[0085] Moreover, when surgeons 2 having different body sizes
alternate during an operation, adjusting the height difference in
the position of the image projection panel 49 due to the height
differences between the surgeons 2 is easily accomplished.
[0086] In FIG. 7, moreover, the horizontal arm unit 44 is arranged
for lefthand operation. However, this configuration can also be
modified such that the horizontal arm unit 44 is arranged on the
righthand side according to particular needs. In such modification,
the surgeon 2 turns at first the transverse fixing knob 61 to
loosen its engagement with the threaded hole 60. Then, the
transverse fixing knob 61 releases its externally threaded distal
end 62 from the fixing hole 63a of the transverse switching stem 59
thereby to release their mutual engagement. In this state, the
transverse switching stem 59 is freely turnable with respect to the
through hole 57 of the vertical mover 45. Therefore, the surgeon 2
turns the horizontal arm unit 44 by 180 degrees around the center
axis 58. Then, the fixing hole 63b of the transverse switching stem
59 is arranged at a position to confront the transverse fixing knob
61. Thus, the surgeon can alone fasten the transverse fixing knob
61 into the threaded hole 60 and insert the same into the fixing
hole 63b of the transverse switching stem 59 so that it is fixed
with respect to the vertical mover 45.
[0087] Next, the surgeon 2 turns back the fixing knob 54 to loosen
it. Then, the joint member 50a and the receiving joint member 51
are released from their fixed states. Then, the surgeon 2 pulls out
the image projection panel 49 in the groove direction of the
grooved portion 55a of the joint member 50a to relieve the image
projection panel 49 from the receiving joint member 51.
Subsequently, the joint member 50b is inserted into the receiving
joint member 51 by engaging the positioning pin 53 with the grooved
portion 55b. Here, the positioning pin 53 and the grooved portion
55b engage so that the image projection panel 49 is arranged at the
same position as that when the horizontal arm unit 44 is arranged
on the lefthand side of the surgeon 2. Then, the fixing knob 54 is
fastened again to fix the joint member 50b and the receiving joint
member 51.
[0088] To store the apparatus, the surgeon 2 first loosens the
housing knob 76 to open the push member 71 slidably in the
direction of the center axis 66. Then, the push member 71 is
released from the abutting force between the serrated portion 72
and the end face of the flange 69b of the housing stem 68 so that
the housing stem 68 can turn on the center axis 66. Here, the
surgeon 2 turns the horizontal arm unit 44 downward. When the
housing knob 76 is fastened again in this state, the fastening
force by the threaded portion 75 urges axially the push member 71
in the direction of the center axis 66 so that the serrated portion
72 of the push member 71 and the end face of the flange 69b come
into abutting engagement. Thus, the housing stem 68 is positioned
and fixed in the turned position. Here, the push member 71 retains
a desired fixing force because its serrated portion 72 abuts
against and engages with the serrated end face of the flange
69b.
[0089] In addition to effects substantially similar to those of the
second embodiment, the third embodiment requires less storage by
providing the horizontal arm unit housing mechanism 48. Moreover,
the horizontal arm unit 44 is arranged on the side of the surgeon 2
so that the position of the grip 56 is closer to the hand of the
surgeon 2. Therefore, the movement of the hand can be reduced for
the moving control thereby to lighten surgeon fatigue. This also
contributes to improving the operation efficiency.
[0090] According to the third embodiment, moreover, the provision
of the transverse switching mechanism 47 permits the arrangement of
the horizontal arm unit 44 on either side of the surgeon 2 in
accordance with need. As a result, it is possible to adjust modes
according to the operation's needs, to improve the overall
operation efficiency.
[0091] The third embodiment should not be limited to the mode
described above but can also be configured by adding a retracting
mechanism 77 such as one shown in FIG. 9 to FIG. 13. In FIG. 9 to
FIG. 13, parts used in third embodiment bear the same designations
and will not be described again.
[0092] Specifically, one horizontal portion 79 of a substantially
L-shaped vertical moving housing 78 is movably assembled, like the
horizontal portion 39 of the vertical moving housing 38, with the
chair 28 (FIG. 9). The other vertical portion 80 of the vertical
moving housing 78 is formed as a hollow structure, and a vertical
mover 81 is jointed to the vertical portion 80 through a vertical
slide mechanism 82. The aforementioned image projecting unit 46 or
the image projecting mechanism is attached to the upper end of the
vertical mover 81.
[0093] At the intermediate portion of the vertical mover 81, there
are sequentially arranged the retracting mechanism 77 (FIG. 10), a
transverse switching mechanism 102 (FIG. 12) and the transverse
switching stem 59 which has the same configuration as that of the
foregoing third embodiment. This series configuration from the
transverse switching stem 59 through the horizontal arm unit 44 to
the image projection panel 49 is similar to that of the third
embodiment.
[0094] The details of the vertical slide mechanism 82 are as
follows. The vertical mover 81 is inserted movably and snugly only
in the direction of arrow Z in FIG. 9 into the inner wall of the
vertical portion 80 of the vertical moving housing 78 through a
cross roller bearing 83 (FIG. 13). A spring member 84 (FIG. 10) is
compressed and arranged between that vertical mover 81 and the
vertical moving housing 78.
[0095] The spring member 84 is preferably a gas spring for
establishing a constant spring force over the entire range in which
the vertical mover 81 can move with respect to the vertical moving
housing 78. The spring force is substantially equalized to the
falling weight, which is exerted from the vertical mover 81 on the
spring member 84.
[0096] The retracting mechanism 77 includes a retracting piece 85
constituting the retracting mechanism 77 which comprises on its two
side faces two stems of a retracting stem 86 and a hollow
retracting stem 87, which are conjugated with respect to the center
axis 58 (FIG. 12). On the other hand, the vertical mover 81 is
provided with a hollow portion 88 having two side walls, in which
through holes 90 and 91 are formed around a retracting stem center
89 perpendicular to the center axis 58. These retracting stem 86
and hollow retracting stem 87 rotatably engage with the through
holes 90 and 91, respectively.
[0097] From the side of the retracting piece 85, protrudes a pivot
pin 92, which turnably supports one end of a link rod 93 (FIG. 11).
This link rod 93 is equipped in its other end with a hole 100 (FIG.
13), in which there is turnably inserted a pivot pin 99 of a
protrusion 98 embedded in a semicircular plate 94. This
semicircular plate 94 is formed substantially into a D-shape by
forming a flat portion 111 at a distance L from the center of a
disc having a diameter R (FIG. 10 to FIG. 13). From the
semicircular plate 94, protrudes a pin 96, which is conjugate with
the disc center and which is turnably engaged by a pivot hole 97
formed in the vertical mover 81 (FIG. 13). Moreover, the flat
portion 111 of the semicircular plate 94 abuts a flat portion 110
formed on the inner wall of the vertical portion 80 of the vertical
moving housing 78 (FIG. 10).
[0098] The vertical portion 80 of the vertical moving housing 78 is
equipped at its upper end with an R-shaped recess 101, which
corresponds to such an R-shape as is conjugate with respect to the
center portion of the disc center of the semicircular plate 94. The
peripheral wall of the semicircular plate 94 is in sliding contact
with that recess 101 (FIG. 11).
[0099] Moreover, the retracting piece 85 is equipped at its upper
portion with a protrusion 109, which retains one end of a spring
107. The other end of this spring 107 is retained by a protrusion
108, which is formed in the hollow portion 88 of the vertical mover
81.
[0100] Next, the transverse switching mechanism 102 will be
described in detail. Specifically, the transverse switching stem 59
is engaged snugly and turnably by a through hole 103 formed in the
retracting piece 85 (FIG. 12). A threaded portion of a transverse
switching knob 104 is adjustably screwed into an internally
threaded portion 105 of the hollow retracting stem 87 arranged in
the retracting piece 85. The threaded portion of the transverse
switching knob 104 is equipped at its distal end with an engagement
portion 106, which is snugly retained by the fixing hole 63a of the
transverse switching stem 59.
[0101] The procedure for moving the image projection panel 49 when
the treating device or another observing device interferes with the
image projection panel 49 during the operation is as follows.
[0102] In case the surgeon 2 intends moving the image projection
panel 49 back and forth in the direction of his or her view, the
surgeon 2 grasps the grip 56 of the horizontal arm unit 44 to apply
the control force back and forth in the direction of arrow X, as
shown in FIG. 9. The control force in the direction X, as applied
to the grip 56, is transmitted through the horizontal arm unit 44,
the horizontal arm unit housing mechanism 48, the transverse switch
mechanism 47 and the retracting mechanism 77 and further to the
vertical mover 81. Then, the control force transmitted to the
vertical mover 81 is transmitted as in the third embodiment to the
vertical moving housing 78. Then, the vertical moving housing 78 is
horizontally moved in the direction X with respect to the support
member 33, because it is arranged to move only in the direction X
through the cross roller bearing 41 with respect to the support
member 33. In accordance with this movement, the image projection
panel 49 and the image projecting units 46 are horizontally moved
together in the direction X and adjusted.
[0103] When the control force is applied by the surgeon 2 in the
direction of arrow Y, as shown in FIG. 9, to the grip 56 of the
horizontal arm unit 44, the control force is transmitted as in the
movement in the direction X to the support member 33. Since the
support member 33 is disposed turnably around the vertical pivot 31
engaged by the through hole 34, it has a turning direction aligned
to the direction Y. By the turning motions, the image projection
panel 49 and the image projecting units 46 are turned together on
the center axis 32 and adjusted in the direction Y.
[0104] Here, the vertical pivot 31 is substantially aligned with
the cervical vertebrae of the surgeon 2 so that the relation
between the relative positions of the image projecting units 46,
the image projection panel 49 and the eyes of the surgeon 2 is also
always maintained. As a result, the surgeon 2 is enabled to
continue the observation merely by turning his or her head toward
the image projection panel 49 without changing his or her body
position with respect to the operative site.
[0105] In case the image projection panel 49 is retracted so that
the surgeon 2 may observe the operative site in direct view during
a series of procedures, the surgeon 2 grasps the grip 56 of the
horizontal arm unit 44 and applies a control force in direction of
arrow Z (i.e., upward), as shown in FIG. 9. Then, the vertical
mover 81 is moved to the uppermost end of the moving range in the
direction Z for the vertical moving housing 78, and the retracting
piece 85 is turned around the retracting stem center 89 when the
control force in the direction Z is further applied. As a result,
the image projection panel 49 is turned together with the
horizontal arm unit 44 around the retracting stem center 89, as
indicated by broken lines in FIG. 9. In these series of controls,
during moving in the Z direction, the flat portion 111 arranged in
the semicircular plate 94 and the flat portion 110 arranged in the
vertical moving housing 78 abut each other so that the semicircular
plate 94 does not turn around the disc center 95. As a result, the
retracting piece 85 made together with the semicircular plate 94
into a parallel link mechanism does not turn around the retracting
stem center 89.
[0106] On the other hand, when the vertical mover 81 is positioned
at the uppermost end of the moving range in the direction Z, as
shown in FIG. 11, the abutment between the flat portion 110 and the
flat portion 111 for regulating the turning motions of the
semicircular plate 94 around the disc center 95 vanishes so that
the retracting piece 85 can turn around the retracting stem center
89. When the surgeon 2 turns the retracting piece 85 around the
retracting stem center 89, the semicircular plate 94 forming the
parallel link mechanism together with the retracting piece 85 turns
around the disc center 95. Then, the R-portion of the semicircular
plate 94 comes into abutment against the R-shaped recess 101
arranged in the vertical moving housing 78. In this state, the
movement in the direction Z is regulated. By the action of the
spring 107, moreover, the balance around the retracting stem center
89 is maintained no matter what the position of the turning state
around the retracting stem center 89 of the retracting piece 85.
Even if, therefore, the surgeon 2 releases the grip 56, the image
projection panel 49 and the horizontal arm unit 44 do not fall, but
keep the moving positions.
[0107] In case the surgeon 2 changes places during the operation
with another surgeon having a different body size, the newly
assigned surgeon 2 grasps the grip 56 of the horizontal arm 44 to
apply the control force in the direction of arrow Z, as shown in
FIG. 9. Then, the control force thus applied to the grip 56 is
transmitted as in the case of the direction X to the vertical mover
81 so that the vertical mover 81 is moved in the direction Z by the
action of the cross roller bearing 83. In response to the movement
of the vertical mover 81 in the direction Z, the image projection
panel 49 and the image projecting unit 46 are vertically moved
together in the direction Z. Thus, the position adjustment of the
image projection panel 49 in the height direction due to the height
difference between the surgeons 2 is realized by the movement
adjustment in the direction Z.
[0108] In addition to the effects of the third embodiment, in the
present embodiment, the image projection panel 49 can be brought to
and arranged at a higher position than the operative site by the
retracting mechanism 77. The image projection panel 49 thus does
not interfere with other devices concentrated near the operative
site, thereby improving the operation efficiency.
[0109] FIG. 14 shows an image observation apparatus according to a
fourth embodiment of the invention. In FIG. 14, portions
corresponding to the first to third embodiments are not described,
but marked with common reference numerals.
[0110] Specifically, a base 112 constituting the supporting
mechanism is equipped at its bottom with a plurality of casters
113, which are arranged at a predetermined interval and can move as
the longitudinal slide mechanism, for example, only in the
direction of arrow X. The image observation apparatus can move on
the floor in the direction X with the plural casters 113. From the
base 112, there is vertically arranged (in the direction Z) a
column 114 having a distal end, onto which a vertical mover 115
acting as the vertical slide mechanism and having a hollow
structure is mounted to slide in the vertical direction (the
direction Z).
[0111] From the upper end of the vertical mover 115, there is
arranged a vertical pivot (a rotational axis) 116. This vertical
pivot 116 is inserted into a through hole 118, which is formed in
one end of a chassis member 117 having a general bow shape so that
it is assembled snugly and turnably in the through hole 118. The
aforementioned image projecting unit 46 is attached to the chassis
member 117 through a column member 119.
[0112] On the distal end of the vertical pivot 116, on the other
hand, there is turnably fitted a first pulley 120, which
constitutes a turn transmission mechanism. On the chassis member
117, moreover, there are individually pivotally mounted a second
pulley 123, a third pulley 124 and a fourth pulley 125, which are
arranged sequentially at the plurality of curbed portions from the
proximal end to distal end of the chassis member 117. These first
to fourth pulleys 120, 123, 124 and 125 are preferably set to have
equal diameters.
[0113] On the upper end of the fourth pulley 125, there is
coaxially stacked a drive gear 126 having a pitch circle diameter
P. In the distal end of the chassis member 117, moreover, there is
formed a through hole 129, in which a stem member 128 is turnably
inserted (another rotational axis). On one end of the stem member
128 is fitted a driven gear 127, which meshes with the drive gear
126. To the other end of the stem member 129 is attached the
substantially central portion of the upper side of the image
projection panel 49. Here, the driven gear 127 has a pitch circle
diameter Q and has a module set identical to that of the drive gear
126.
[0114] On the other hand, a timing belt 130 runs between the first
pulley 120 and the second pulley 123, and a timing belt 131 runs
between the second pulley 123 and the third pulley 124. Moreover, a
further timing belt 132 extends between the third pulley 124 and
the fourth pulley 125. The chassis member 117 is so covered with a
cover 121 as to shield the first to fourth pulleys 120, 123, 124
and 125, the drive gear 126 and the driven gear 127. Here, these
first to fourth pulleys 120, 123, 124 and 125 are associated
through the timing belts 130, 131 and 132 to configure a mechanism
for facing an image.
[0115] The image projection panel 49 supported by the stem member
128 of the chassis member 117 is arranged in such relation to the
surgeon 2 that the surgeon 2 and the turning center of the vertical
pivot 116 are aligned on an axis 133 extending in the normal
direction from the center of the image projection panel 49, as
shown in FIG. 15. Moreover, the image projected from the image
projecting unit 46 in the direction of an axis 134 is so reflected
by the image projection panel 49 that it may be focused on the
position of a distance d on the axis 133. Here, the surgeon 2, the
vertical pivot 116 and the image projection panel 49 are arranged
in such a manner that the distance from the image projection panel
49 to the observing position of the surgeon 2 is set to d and the
distance from the image projection panel 49 to the center of the
vertical pivot 116 is set to D (FIG. 15).
[0116] In case, therefore, the chassis member 117 is turned by
.theta. degrees on the vertical pivot from the position of FIG. 15,
an angle of .alpha. degrees is made, as shown in FIG. 16, between
the axis 134 joining the center of the vertical pivot 116 and the
center of the image projection panel 49 and an axis 135 joining the
surgeon 2 and the center of the image projection panel 49.
[0117] The relation between the reduction ratio .epsilon. of the
drive gear 126 and the driven gear 127 and the .theta. is desired
to satisfy the following relation, but this relation cannot be
realized by the ratio of P/Q of the pitch circle diameters:
.epsilon.={sin.sup.-1(D/dsin .theta.)}/2.theta.-1/2.
[0118] For .theta.=30 degrees, the reduction ration .epsilon.1 is
expressed by: .epsilon.1=sin.sup.-1(D/2d)/60-1/2=P/Q. Here, a
series of components from the vertical pivot 116 through the
chassis member 117 to the stem member 128 configure a vertical
turning mechanism (a linking mechanism).
[0119] In the configuration thus far described, the surgeon 2 moves
the image projection panel 49 selectively, in case the treating
device or another observing device interferes with the image
projection panel 49 during the operation. In the first case, in
which the surgeon 2 intends moving the image projection panel 49
back and forth in the direction of his or her view, the surgeon 2
grasps the chassis member 117 to apply the control force in the
longitudinal direction or the directions of arrow X, as shown in
FIG. 14. Then, the control force in the direction X is transmitted
through the chassis member 117 and the vertical mover 115 to the
column 114. As a result, the casters 113 are forced to move in the
direction X so that the apparatus is moved and adjusted in its
entirety in the direction X.
[0120] When the surgeon 2 applies the control force in the
direction Y, on the other hand, the chassis member 117 is turned
around the vertical pivot 116. In case the chassis member 117 is
turned by .theta. degrees, as shown in FIG. 16, the first pulley
120 and the chassis member 117 turn relative to each other. Then,
the second pulley 123, the third pulley 124 and the fourth pulley
125 are sequentially turned by the timing belts 130, 131 and 132,
so that the drive gear 126 is turned by .theta. degrees. At this
time, the drive gear 126 turns the driven gear 127 to turn the
image projection panel 49 through the stem member 128. Here, the
turning angle of the image projection panel 49, i.e., the turning
angle of the driven gear 127, is .alpha./2 degrees according to the
relation of the gear ratio of P/Q, as shown in FIG. 16.
[0121] Specifically, the driven gear 127 has the following relation
to the turning angle .alpha./2, in case the drive gear 126 turns by
the angle .theta. with the drive gear 126 of the pitch circle
diameter P and the driven gear 127 of the pitch circle diameter Q
meshing with each other: .alpha./2=P.theta./Q (1).
[0122] Next, the following relation holds for the case where the
angle between the axis 133 and the axis 135 shown in FIG. 16 is
designated by .theta.': .alpha.=.theta.'-.theta. (2). The following
formula is deduced from equations (1) and (2):
P/Q=(.theta.'-.theta.)/(2.theta.) (3). In the configuration shown
in FIG. 16, the following relation holds: dsin .theta.'=Dsin
.theta. (4). The relation of the aforementioned reduction ratio
.epsilon. can be deduced on the basis of equations (3) and (4).
[0123] Now will be described the case in which retraction is taken
of the image projection panel 49 so that the surgeon 2 may observe
the operative site in direct view during a series of operations,
for example. This control is also likewise adjusted in case the
surgeons 2 having different body sizes alternate during the
operation.
[0124] Specifically, the surgeon 2 grasps the chassis member 117
and applies the control force in the direction of arrow Z, as shown
in FIG. 14. This control force applied to the chassis member 117 is
transmitted, as in the case of the aforementioned control of the
direction X, to the vertical mover 115 so that this vertical mover
115 is moved in the direction Z relative to the column 114. As a
result, the image projection panel 49 and the image projecting unit
46 are moved together vertically in the direction Z. In other
words, the position adjustment of the image projection panel 49 in
the height direction due to the height difference between the
surgeons 2 is made by the movement in the direction Z.
[0125] According to the fourth embodiment, the vertical pivot 116
can be arranged on the axis of the vertical mover 115 having no
relation to the position of the cervical vertebrae of the surgeon
2, so that the appearance and shape can be simplified. As a result,
it is possible to realize a configuration that is not likely to
obstruct the operation, thereby to improve the operation efficiency
as much as possible.
[0126] The fourth embodiment has been described for the case where
the turning angle of .alpha./2 of the image projection panel 49 is
determined by the ratio of the pitch circle diameters of the drive
gear 126 and the driven gear 127. However, the invention is not
limited thereto but can also be configured such that the decision
is made by altering the external diameters of the first to fourth
pulleys 120, 123, 124 and 125.
[0127] Moreover, the fourth embodiment is exemplified by the
example using the image projection panel 49 and the image
projecting unit 46 disclosed in JP-A-2003-233031, as the image
display member. However, the invention is not so limited, but can
also be configured by using LCD or other displays. In this
modification, however, the turning angle of .alpha./2 should be
doubled to .alpha..
[0128] FIG. 17 shows an image observation apparatus according to a
fifth embodiment of the invention. In FIG. 17, portions
corresponding to the third embodiment are not described, but merely
marked with the same reference numerals.
[0129] In this fifth embodiment, the substantially L-shaped
vertical moving housing 38 of the third embodiment is replaced by a
vertical moving housing 136 having a substantially straight hollow
structure. This vertical moving housing 136 is turnably erected at
its proximal end from the aforementioned base 112 through a
vertical pivot 137. This base 112 is provided with plural casters
113 at a predetermined interval. The image observation apparatus
can move on the floor through those casters 113.
[0130] Into the distal end of the vertical moving housing 136 is
also movably inserted one end of the vertical mover 45, with which
the aforementioned horizontal arm unit 44 through the transverse
switching mechanism 47 and the horizontal arm unit housing
mechanism 48 are associated. To the distal end of the horizontal
arm unit 44 is attached an extension arm 138, which extends to the
center of the image projection panel 49.
[0131] At the distal end of the extension arm 138 is provided a
panel pivot 139 that can turn in the vertical direction, as shown
in FIG. 18. A motor 140 is also arranged at the distal end of the
extension arm 138. This motor 140 has its turning output spindle
connected to the panel pivot 139. Moreover, the motor 140 is
electrically connected through a connection cable 144 with a
control circuit 143 contained in the display image confronting
mechanism.
[0132] At the vertical mover 45, moreover, there is arranged an
ultrasonic length measuring device 141, which is positioned on the
back of the head of the surgeon 2. At the aforementioned base 112,
moreover, there is arranged a rotary encoder 142, which has a
turning input shaft connected to the vertical pivot 137. These
ultrasonic length measuring device 141 and rotary encoder 142 are
electrically connected with the aforementioned control circuit 143
through the connection cable 144.
[0133] The control circuit 143 controls the turning angle .beta. of
the motor 140 according to the following relation, where the
distance from the center of the vertical pivot 137 to the image
projection panel 49 is designated by D, the distance from the image
projection panel 49 to the observing position of the surgeon 2 is
designated by d, and the turning angle of the vertical pivot 137 is
designated by .theta.: .beta.=1/2{sin.sup.-1(D/dsin
.theta.)-.theta.}.
[0134] In the configuration thus made, the surgeon 2 grasps the
grip 56 and applies the control force in the direction of arrow X,
as shown in FIG. 17, in the case where the treating device or
another observing device interferes with the image projection panel
49 during the operation. Then, the control force is transmitted to
the vertical moving housing 136 through the arm unit 44 and the
vertical mover 45 so that the casters 113 of the base 112 raising
the vertical moving housing 136 are moved in the direction X to
adjust the longitudinal direction.
[0135] Where, on the other hand, the surgeon 2 applies the control
force in the direction Y to the grip 56, the control force is
transmitted to the vertical moving housing 136 through the arm unit
44 and the vertical mover 45 so that the vertical pivot 137 is
turned relative to the base 112. This turning angle .theta. is
detected by the rotary encoder 142, which outputs its detection
signal to the control circuit 143. Simultaneously with this, the
distance from the ultrasonic length measuring device 141 to the
surgeon 2 is detected by the ultrasonic length measuring device
141, and the detection signal is input to the control circuit 143.
In response, the control circuit 143 calculates the distance d from
the image projection panel 49 to the observing position of the
surgeon 2, which distance is obtained from the initially given
distance D by the ultrasonic distance measuring device 141, and
creates a motor drive signal so that the motor 140 is turned by the
angle .beta. on the basis of that motor drive signal.
[0136] As a result, even where the surgeon 2 moves the image
projection panel 49 by turning it by the angle .theta. around the
center of the vertical pivot 137, the surgeon 2 is able to look at
the observation image from the image projection panel 49 at all
times merely turning only his or her face toward the image
projection panel 49, without moving the body.
[0137] According to the fifth embodiment, the image projection
panel 49 can be reliably directed toward the surgeon 2 by the
control of the control circuit 143. Moreover, the controllability
can be improved to improve the operation efficiency.
[0138] While there has been shown and described what is considered
to be preferred embodiments of the invention, it will, of course,
be understood that various modifications and changes in form or
detail could readily be made without departing from the spirit of
the invention. It is, therefore, intended that the invention be not
limited to the exact forms described and illustrated, but should be
constructed to cover all modifications that may fall within the
scope of the appended claims.
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